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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '628141d4edcc166ea307d8e371d7904a149e4a8959d9f1ec89e85012c0c14830' 
  AND token = '6uhAVkHnSEiFTjIEVu5aMLLqqiVo4jBTWyDgLK5RFdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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