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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d8238a0c529815438ce7492405ae248d655a454576ef2d6266ff6afd4452bf' 
  AND token = 'p6L8uHpEEBs7np3W+H/DI424BETHs99g9yvgeLF9rTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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