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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68559a5de651e553017c41b9c838727586be55df16946ff7b4476696e070d37f' 
  AND token = 'sbEoZFMrt5CKyICtqlCL+0iKiEp+vgFHMjpPRJBpogk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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