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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf20a0a49f42c8011b977ccccd081b0ed0c3d4232ec6320acd9739d054cda27' 
  AND token = 'nqO79f+tAHl7qx3blMRrYPFa7/a0yvdUJwpb+XebLBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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