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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e46303d0bf2cec56f7f6e70a13a5dfbcd927ef8b778d7d7431d586a3c671734' 
  AND token = 'maLHUiRRMbHP1JaSY+pnzCuVi2bGj0EgaaA/2kHbluY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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