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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd725be9e4b6a370bab3222eabfb9a1ab0d5979cb54f1d031a450f359ccf6f1' 
  AND token = 'Pa9I18UIJk1Hh4Z2k3on1S/8hETPteDtOAxCj+asHno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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