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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aed412cadd3a2f908c37270bdeb8f984850b744580969b18dc0d7c9cf3c535f' 
  AND token = 'D69EZqGCUxb3zeFLHzKncQredHuPwlF7S8M2/g+Qdr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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