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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d5f05034ac71897f2b48ceb45c552632aff785fc2d62b0f14b9daa35d2fbaa' 
  AND token = 'KqN8rtsYzN60c5eVsZb018beIT6hK0YK4pzWTUXvsbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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