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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734c7a486846ed9a66c9c8758f0d4d2f2e2df619edb146b03d0f24a4f1619f97' 
  AND token = 'DnR5Z1rmfGAj2gzuk4GX4xnvkVbK0UWNE+CwUCv40i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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