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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7d5d985415b8f7c06eb28a3af0e157a1f91910e13871beb218be4cfb3d294c' 
  AND token = 'bwXWN0gDOARBl7HcdzAz+O0rvnZWfzrPOShr1HNIQx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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