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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bf2c121902ee5a77ca77ce86cdce22a9bf1508e85dc5f270e06b44a98896fb' 
  AND token = 'McJC8Xd29omwyeJ12TEF/euOGKY+5q0Mu4HCGAZdBWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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