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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf44b937497296efc0a51b90ce118970c9d077785521d47fbfaa4ca7f2019ccd' 
  AND token = '9SHkowtfPFBNpte3kt6omSoJnR8YERN7yYAqbz36Rv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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