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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f070c7aeaff1352640a559c79fb9b87736a0bcec76b402c629bf11c545553bd' 
  AND token = '/Ot3g6PPNlG/F8O9OjxW7OF4zoQ75dwbbVHThTh7e9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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