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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83a9080e17914a3284527d0676b9d67d9ee85a040bc0f0cbaa363dfc18aa440' 
  AND token = 'QykXHyVnbusV0a+yJ1MpmcoPMN4ojvg13szKvZcdrc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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