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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84510088c500a2dc6a2425fa8f5e99b2965c0fcbd53338930846e5cd9d3f98d2' 
  AND token = 'CNuPwkex8zfStPOb8+QEU2ACmPC/zl0Gk2CstfZSG/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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