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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ee9536bc73fdca7bc3d0e59e178ed72b0fd8ce03b5ea013b941ffd4c757fa1' 
  AND token = 'pxhj8bSX901Tr1naG5St0S6fLccAIZM9ECGp8hi9Spw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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