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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e49c748b6391b63accfbd379eefe0da938ba8f4807b13cb15722872cc7b92a4' 
  AND token = 's944eElIJFKv9pE+Pk8dMxI8/8dk4DcfmiLLArCdYl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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