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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc307488a532b57550bf178f95b20a47da5d96596f363dee8fd1ca7e1d13ae75' 
  AND token = 'n/1GfWp316vko4+Ex997je4fSKeo3J0OCHsQivaRmQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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