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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1945519307a2bff44041ac003a70fa210de5fb850a571695715fd228990584e2' 
  AND token = 'RK8vmK7bslILrLITBRR606/p219z709EVs0C8MlDLHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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