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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4321affa219de634036acc2687f0aa08ae660579c778f22170bfcfa3944e9b3' 
  AND token = 'hnNcU2kU3zbS6ji4+sr4pa96dgtKgh96oPcK0XiT6/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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