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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720056ed7786a55817a5085b32669e4597291f27e9056257876a6197df90464c' 
  AND token = '/h9F0n67IfRulzJk/QphBdZgqGAQk/hkl33ds4n9NaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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