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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3987733bdcae1e5e693483e8ee2647b5a399f1ae6e4781c60c58c9facaebc18c' 
  AND token = 'v0wPl6eT64TZ/odERtl9G1h5JiVsbgC7xE+nmtgOf/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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