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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc51dbdaa6c704c6a11b33f4bb8aefe554ac08cd4e52e67e177932361b9c3f26' 
  AND token = 'a54HCdNmnnrAUvJtp/bF0axD92vv9K382z9lbqSEMnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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