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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c3f2fe53e24fef22eca6f6b1670bb9a07b3422fce6ea0c8d43dea3ec6a736c2' 
  AND token = 'lq9z4i3Yfbmlcpr7Aon4ssvs4kbE3yBvjZBNjvidIRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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