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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d67f8365b5a1e7dbd42c3dccde9555de3c3813b26bae84ae59d9b59110044c5' 
  AND token = '5XQbT95sZvYis1g9Y59JQ1i188VFADFC6CtgScBJPls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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