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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6607fe251c5714ecc1798bbe6e85d53b3c4131ade25bd8200cc57de0ea9010e2' 
  AND token = 'K73q82aLbedvucxKMDGEmpDX3L7urSzgeF2IJTGWpq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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