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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec7db7250cccd0d1f3ee5fc131e85614868c2ea79eb67c1109a49f73f0bfcc7' 
  AND token = '8FBuMl5HolN5KDP4z11VRKVTd6nu4ePoF2HMJ1BHbU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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