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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d1d82b7df1183f37c745b648f3b15d872db3edd3c2f7bcf25980701a3ef316' 
  AND token = 'ArSdxqxOmKQuz/uc3P+KA/pp0J3VQzh4XyVEp3cVV2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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