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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617772d1b05dd73be85d5b7797986a195db1793890ab418ba33b460e45abf079' 
  AND token = '4ie9CllcWWoprLeOyHLCZpRyE8liwkm7O7LzoZXs+oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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