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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ebe984d5ae2b5f2aad77669217c47d2547bb2c3b3d9dedca9c322f2e9e139a' 
  AND token = 'MI/NHHdgKLL1US+GbAc0LgL9F9pOhTM/6/WaB/s9w00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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