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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4f9a0828c878c6914ad19c72de9e10668d077b3a381342aed1741f0d4d0727' 
  AND token = '98A2d1chirHwHv1ls/A0YNX0/N5n3OrheOAhIbIyE4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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