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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdfa123ca8b25a054333ea387199c5f32419ce1a0d52fddc5c6199287a311b7' 
  AND token = 'OGpKo+H+w9I4M+uDGiNRXzjTPkc43gQjqR9AMeUiHZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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