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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a04c9d2d993c149b34ea216197ebfffabe4baebeee1947fb972f4fbf87ae71' 
  AND token = 'NbczJJeYA1dbrl1a3UBU+Wom1VOx7ewaU00j1BshHi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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