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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a602df39a53951a922a631a9df289e799006e0917e773f7dc5a63d16e98abe84' 
  AND token = 'UddEGc8K1IFRiyPBFxFKunh3L1n8MyM2Of3ZpJvx12w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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