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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa056174125fb794a21cb11e84dd42673f300a5e0c7e41cf4b52785a3c9e78de' 
  AND token = 'fIjcdqNkLt87/KjPROGCEQttfkKC3oXYV1gCHAV1f4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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