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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5f6f02c3602082541cfca587fd2bc3a96d16194f64fd9c4b30fe41d1391d82' 
  AND token = 'hKEK8Sx7y4dXtVCQWfJQ/qtj9ud5xPOFvKyFS1epiNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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