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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d097d2d13137a2e29d60913f826e14fa3ed9b1a686d27a53cd7f046400788c' 
  AND token = 'gadH+1HL7G5r/1VcO84QRcQPLekpDYv7Q4VImUlHsOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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