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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f25195c167dc608f5118efc4b8d47c86d4a9289f51ff6ec67c81a493aae4fb' 
  AND token = 'E9vup3inD04OOB1zZ0cAzB6e902nmPUoQtoA19DKUrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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