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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ef516f8fe1d38ff2f7177efc3da1bb4af286f482f952b07dc8613c0e792f33a' 
  AND token = 'Ufp1IcTNJkg1SeMTzqQrvKqlq3AxJeU7j55/KnmFxT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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