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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29247290150897d0f39ab565d1dbd7fabdf6358782da38199d2b872dbdb57a6c' 
  AND token = 'qpFrVh48y3u3qD5G4o4RFyTG8r08Opi5oUAUVGN9VYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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