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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e964007efc3a5201539228a991ef06628c3f90e706fab04130be30f92667132' 
  AND token = 'JNW9EvsjTn62upyu2Fr1VNgENeYCW2+USGk/Lrta8Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}