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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aced49cb595d31a8d92e7e8b47cf00a14e66c03dc4cc95e90b1607aa3d246693' 
  AND token = '8JevpM0ujEme2usYTZle2oP3bjW5z4Q7pV0Gi5OJIYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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