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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ed2cfc04c0abc8890220f0d1c5c3cbf0b0d6b4465e1421bec6721301f8b18a' 
  AND token = 'LY4N4rUA/75pbN5m+Z2t61chdbyO9Da2nZkUgLsu/00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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