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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91e9499b3e125a5de267e879364472f9e367de34bde1f8acdd218fc1f0692e9' 
  AND token = 'PPLTk0f6dVZI8MATKTi+jnrAwp1MkF65Ck/gsPgZG9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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