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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c808bc3abb20d47f93aae9f8903635468a288802f927adc94d4195f8a770d5' 
  AND token = '/mUNtTeEFCF6I6DKiV/Pi+f80qBabYYXlr4/dCEdrRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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