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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b1e34e0c84de86dbbc521f6f600d215a161bd8f3c163fb7a54758961e2f28d' 
  AND token = 'lEHGhLJJmp8I6oJcfSn5c4uyR5OpbbmMc+LnlHL6Ino=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

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