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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23848a2bb072bd15a3bdbbd534f844fb17b938d2d78ef54e55d7a8de016214de' 
  AND token = 'biG+qV5sNVTNAR4uajvrTfRddkRAwQzoPG1lN1ipi3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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