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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e93881edf05e79c878bac7eda55d5113f24c998adbc0544f4996a04e57c3667' 
  AND token = '8RUqTI5rM4d1G7VeEmxtFUg7OjDiRLnSf3lvLxcmpTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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