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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ead662e34fda4c652aa90362e2a29107c709a932237eec5d1b6dc3ac3a6968' 
  AND token = 'so2I4bwHEiEYR+PTVIraH9ov5RzX0bedXxMUjNEkIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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