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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae18707d57cbbc0fdb3b8d11b7da99ebef69e46a2380d25d424d2f6d7c8f580' 
  AND token = '3ivHuuN6ADxVNJNXVvyUablGLZlK1HTaG5oargbf1PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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