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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8908c17a845231577d26791931f857106790519f8bbb34661ee6d26195572ae0' 
  AND token = 'U2WHLDk6UmCkf86tfnJmAF/p05c2dE4aPU8EOx5o2ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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