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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43de0791d1bffde5d14a8e8b347191baed591fbac44305d78523098ec6ece457' 
  AND token = '2x3O7QGBe5IRDWiUx6i6emfFPa3+wy3RgUwpvMxurIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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