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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1234836bb842437e591a40c990b314ded833df6fbe9301a6a729c7226dec359' 
  AND token = 'HvAxmUvk8m7QcdKltz4dtf0bBZnmhyKj9fhXCKKT6uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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