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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2513809fb53d25d9b0b0a493a8f7b5f58c20413a868860a204464e8d7d227a0a' 
  AND token = 'ACdAVAIdoR6xOV/U8q93h7851k7QG1sg5wzkJdJ1KCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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